ESX host WWPN or WWNN are stored as long numbers. How do I work with these values?

I need to update our machine database with the WWPN and WWNN of each ESX host.  These are stored as long integers.  What is the correct way to deal with a long integer like one associated with a 64bit mac?  Is there a mechanism within vRO for this?  If the number was stored as a string I could work with it but when I try to convert it using .toString() I end up with an incorrect value.